diff --git a/1.4/Assemblies/RJW_Menstruation.dll b/1.4/Assemblies/RJW_Menstruation.dll
index bd3e682..1ef9e7f 100644
Binary files a/1.4/Assemblies/RJW_Menstruation.dll and b/1.4/Assemblies/RJW_Menstruation.dll differ
diff --git a/1.4/source/RJW_Menstruation/RJW_Menstruation/HediffComps/HediffComp_PregeneratedBabies.cs b/1.4/source/RJW_Menstruation/RJW_Menstruation/HediffComps/HediffComp_PregeneratedBabies.cs
index eed7327..c83daef 100644
--- a/1.4/source/RJW_Menstruation/RJW_Menstruation/HediffComps/HediffComp_PregeneratedBabies.cs
+++ b/1.4/source/RJW_Menstruation/RJW_Menstruation/HediffComps/HediffComp_PregeneratedBabies.cs
@@ -283,4 +283,18 @@ namespace RJW_Menstruation
             }
         }
     }
+
+    // HAR patches ApplyBirthOutcome to produce multiple babies based on the mother's littersize. But the pregenerated babies system already makes multiple babies
+    // So make it always consider the mother to have one baby
+    public static class HAR_LitterSize_Undo
+    {
+        public static void Postfix(ref int __result, Pawn mother)
+        {
+            if (Configurations.PregnancySource != Configurations.PregnancyType.Biotech || !Configurations.EnableBiotechTwins) return;
+            // 'mother' is the genetic mother, but unless she's in labor at the same time the birtherthing is spitting out, this will work as intended
+            if (mother?.health.hediffSet.GetFirstHediff<Hediff_LaborPushing>()?.TryGetComp<HediffComp_PregeneratedBabies>()?.HasBaby ?? false)
+                __result = 0;
+            return;
+        }
+    }
 }
diff --git a/1.4/source/RJW_Menstruation/RJW_Menstruation/Patch/Harmony.cs b/1.4/source/RJW_Menstruation/RJW_Menstruation/Patch/Harmony.cs
index d701d49..29978fd 100644
--- a/1.4/source/RJW_Menstruation/RJW_Menstruation/Patch/Harmony.cs
+++ b/1.4/source/RJW_Menstruation/RJW_Menstruation/Patch/Harmony.cs
@@ -1,4 +1,5 @@
-using HarmonyLib;
+using AlienRace;
+using HarmonyLib;
 using rjw;
 using rjw.Modules.Interactions.Internals.Implementation;
 using rjw.Modules.Interactions.Rules.PartKindUsageRules;
@@ -16,6 +17,11 @@ namespace RJW_Menstruation
         {
             Harmony har = new Harmony("RJW_Menstruation");
             har.PatchAll(Assembly.GetExecutingAssembly());
+            if (ModsConfig.IsActive("erdelf.HumanoidAlienRaces"))   // Don't use the cached in Configurations, it isn't initialized yet
+            {
+                har.Patch(typeof(AlienRace.HarmonyPatches).GetMethod(nameof(AlienRace.HarmonyPatches.BirthOutcomeMultiplier)),
+                    postfix: new HarmonyMethod(typeof(HAR_LitterSize_Undo).GetMethod(nameof(HAR_LitterSize_Undo.Postfix))));
+            }
 
             InjectIntoRjwInteractionServices();
         }